| 英文摘要 |
要：
Since the original plants have all been washed away due to river flood, the amount of water gradually reduced on October. The dust problem got worse because emerged sandbars were gradually exposed, the northeast monsoon prevailed, and farm digging operated. To resolve poor air quality problems in surrounding areas step by step, the different dust suppression methods were applied for first try on river bare land in this project, and the effectiveness were evaluated.
First of all, aerial photography and literature review were carried out to investigate the area of bare land in different seasons on the downstream section. This analysis could be the basis for future air pollution simulations. The cases of dust suppression on river were collected as a reference for future application. Besides, the soil particle size and ions property were investigated by series of experiments. It could be a reference for the forming of the dust. Six field test works, such as scene vein type, island hopping, embankment, water spray, dust pharmacy, and windbreak were tested. The cost and effectiveness were analyzed. A comprehensive assessment was carried out to estimated the effect of dust depression with the various methods.
In this project, the legal feasibility assessment was applied on river sand dredging and utilization of tidal river water. The feasibility assessment on the land acquisition, market and financial feasibility assessment, and engineering technology were carried out, too.
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